An efficient composite magnetocaloric material with a tunable temperature transition in K-deficient manganites

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34271-34279 ◽  
Author(s):  
R. Skini ◽  
M. Khlifi ◽  
E. K. Hlil
Keyword(s):  
Magnetic Material ◽  
Potassium Deficiency ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Temperature Transition ◽  
Temperature Range

This paper reports on a magnetic material with high steady relative cooling power (RCP) over a temperature range from 325 to 275 K induced by potassium-deficiency in polycrystalline samples of La0.8K0.2−x□xMnO3 (x = 0, 0.1 and 0.2).

Large Relative Cooling Power in Dy[sub 5]Si[sub 4]:Dy[sub 5]Si[sub 3] composite

2011 ◽  
Author(s):  
S. Shanmukharao Samatham ◽  
D. Venkateshwarlu ◽  
Swati Pandya ◽  
Mohan Gangrade ◽  
L. S. Sharath Chandra ◽  
...  
Keyword(s):  
Relative Cooling Power ◽  
Cooling Power

scholarly journals Relative cooling power modeling of lanthanum manganites using Gaussian process regression

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20646-20653 ◽  
Author(s):  
Yun Zhang ◽  
Xiaojie Xu
Keyword(s):  
Gaussian Process ◽  
Gaussian Process Regression ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Power Modeling ◽  
Lanthanum Manganites

Experimental vs. predicted relative cooling power of lanthanum manganites.

Tuning magnetoresistive and magnetocaloric properties via grain boundaries engineering in granular manganites

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77284-77290 ◽  
Author(s):  
Abd El-Moez A. Mohamed ◽  
Mohamed A. Mohamed ◽  
V. Vega ◽  
B. Hernando ◽  
A. M. Ahmed
Keyword(s):  
Grain Boundaries ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Magnetocaloric Properties

The effect of interface size on the relative cooling power and magnetoresistive properties of La0.7Ba0.3MnO3 compounds is investigated.

scholarly journals Magnetocaloric effect and improved relative cooling power in (La0.7Sr0.3MnO3/SrRuO3) superlattices

2011 ◽  
Vol 23 (5) ◽  
pp. 052201 ◽  
Author(s):  
Q Zhang ◽  
S Thota ◽  
F Guillou ◽  
P Padhan ◽  
V Hardy ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Relative Cooling Power ◽  
Cooling Power

Field Dependence of the Refrigerant Capacity for La0.6Ca0.4MnO3 Manganite

2009 ◽  
Vol 154 ◽  
pp. 163-168 ◽  
Author(s):  
R.A. Szymczak ◽  
Aleksandra Kolano-Burian ◽  
Roman Kolano ◽  
R. Puzniak ◽  
V.P. Dyakonov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Curie Temperature ◽  
Statistical Model ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Magnetic Entropy ◽  
Refrigerant Capacity ◽  
Jahn Teller

The magnetocaloric effect in La0.6Ca0.4MnO3 manganite has been investigated. The isothermal magnetization versus applied magnetic field at various temperatures in the vicinity of Curie temperature was measured, and the temperature dependence of magnetic entropy change was determined using Maxwell’s relation. This value is comparable to that in Gd. Nevertheless, the relative cooling power of La0.6Ca0.4MnO3 was shown to be considerably lower than that of Gd. The experimental results have been analyzed in frames of a phenomenological statistical model. This model considers explicitly Jahn-Teller interactions and allows prediction of the field dependences of the magnetic entropy change and the relative cooling power.

scholarly journals Preparation of La0.7Ca0.3−xSrxMnO3 Manganites by Four Synthesis Methods and Their Influence on the Magnetic Properties and Relative Cooling Power

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 309 ◽  
Author(s):  
María Botello-Zubiate ◽  
María Grijalva-Castillo ◽  
Daniel Soto-Parra ◽  
Renee Sáenz-Hernández ◽  
Carlos Santillán-Rodríguez ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Pechini Method ◽  
Sol Gel ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Synthesis Methods ◽  
Consolidation Process

Manganites of the family La0.7Ca0.3−xSrxMnO3 were fabricated by four preparation methods: (a) the microwave-assisted sol-gel Pechini method; (b) sol-gel Pechini chemical synthesis; (c) solid-state reaction with a planetary mill; and (d) solid-state reaction with an attritor mill, in order to study the effect of the preparation route used on its magnetocaloric and magnetic properties. In addition, the manganites manufactured by the Pechini sol-gel method were compacted using Spark Plasma Sintering (SPS) to determine how the consolidation process influences its magnetocaloric properties. The Curie temperatures of manganites prepared by the different methods were determined in ~295 K, with the exception of those prepared by a solid-state reaction with an attritor mill which was 301 K, so there is no correlation between the particle size and the Curie temperature. All samples gave a positive slope in the Arrot plots, which implies that the samples underwent a second order Ferromagnetic (FM)–Paramagnetic (PM) phase transition. Pechini sol-gel manganite presents higher values of Relative Cooling Power (RCP) than the solid-state reaction manganite, because its entropy change curves are smaller, but wider, associated to the particle size obtained by the preparation method. The SPS technique proved to be easier and faster in producing consolidated solids for applications in active magnetic regenerative refrigeration compared with other compaction methods.

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